Part 4 - Berg - Hughes Center
Part 4 - Berg - Hughes Center
Part 4 - Berg - Hughes Center
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Smackover limestone. The Bossier grades upward into the overlying Terryville<br />
Formation.<br />
Terryville Sandstone<br />
The Terryville, which consists of regressive massive white quartzose sandstones,<br />
extends from Ouachita Parish westward through southern Caddo Parish, Louisiana (Mann<br />
and Thomas, 1964). It was deposited as an offshore sand barrier island that separated the<br />
open sea on the south from a coastal lagoon on the north (Forgotson, 1954; Sloane,<br />
1958). The Terryville attains a maximum thickness of about 1,400 ft (426 m). Only a few<br />
thin, dark gray shale beds occur in this sandstone sequence. The Terryville interval<br />
consists of five sandstone tongues; each of the tongues is composed of one to five<br />
regionally extensive blanket sandstone beds, which are 10 to 50 ft (3-15 m) thick. Oyster<br />
beds occur at the pinch-out edges of some of the sandstones. The Terryville Sandstone<br />
interfingers with and grades northward into the overlying and laterally equivalent Hico<br />
Shale.<br />
Hico Shale<br />
In northern Louisiana, the Hico Shale consists mainly of dark gray shale and a few<br />
thin beds of silty limestone, siltstone, and sandstone. Locally, thin beds of carbonaceous<br />
and pyritic sandstone and shale are present. The dark shales of the Hico are believed to be<br />
a lagoonal facies that accumulated adjacent to the Terryville barrier island (Forgotson,<br />
1954).<br />
Knowles Limestone<br />
The Knowles Limestone in Louisiana, which consists of alternating dark gray,<br />
argillaceous limestone and gray shale, is 300 to 400 ft thick (Mann and Thomas, 1964).<br />
Thin lenses of sandstone occur within, and locally supplant, some of the limestone units.<br />
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